munsie



(N0-Model.) 2 sheets-sheet 1.

f J. F. MUNSIE.

INSULATOR,

No. 426,203. PatentedApr. 22, 1890.

51M) anke@ fm1? Mamie j we Noam Penna oooooooooooooooooooooooooooooooo c.

(No Model.) 2 Sheets-Sheet 2. J. P. MUNSIE.

INSULATOR.

Patented Apr. 22, 1890.

UNITED STATES PATENT OFFICE.

JAMES E. MUNsiE, or BROOKLYN, AssIeNoE To THOMAs L. ooLEs, or NEW YORK, N. Y.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 426,203, dated April 22, 1890'.

Application filed January 17, 1890. Serial No. 337,247. (No model.)

T all 1072/0171/ it may concern: Similar numerals of reference indicate simi- Be it known that I, JAMES F, MUNSTE, a lar parts throughout the several views. British subject, residing at Brooklyn, in the Referring to the drawings, 7 indicatesa pole county of Kings and State of New York, have or standard provided on opposite sides with 55 invented certain new and4 useful lmprovethe cross-arms S 9. To these cross-arms is ments in Overhead or Air-Line Systems of screwed,nailed,orotherwiserigidlyconneeted Electrical Conductors; and l do hereby dea wire-supporting piece or bed-piece l0, conclare the following to be a full, clear, and eX- stituting one of the elements of my invention. act description of the invention, such as will This bed-piece 10 is provided with a central 6o [o enable others skilled in the artto which it longitudinal groove or depression lined with appertains to make and use the saine. sheet-rubber 1l or its equivalent, and at its My invention relates to certain new and usemiddle portion beneath the rubber there is ful improvements in overhead or air-line syscut into the wood a series of cross-indentatems of electrical conductors, and particularly tions 12, forming a partial screw-thread, into 65 [5 in the means employed for attaching said conwhich the rubber is adapted to be passed bv ductors to their points of suspension, such as the clamping operation. At its opposite ends the cross-arms of posts and the like. 13 14 the bed-piece l0 is tapered oli' eonically. The object of the invention is to furnish as Surmounting the bed-piece 1 0 is a similar an efficient substitute for the insulators cap-piece 15, having a corresponding longi- 7o ordinarily employed for this purpose a device tudinal groove 16, rubber lining 17, middle that will render it unnecessary to bend or screw-threadindentations 18, and conical ends twist the Wire at the point of attachment, 1.9 20. The rubber-lined grooves of the two (therebytending to injure the insulating coatpieces are of such shape as to receive between ing or covering upon the wire,) but which will themthe insulated conductor or line-wire 2l. z 5 clasp or bind upon a straight section of the rlhe means employed for forcing the eapwire with suliicient clamping force to attach piece 15 toward the bed-piece l0, so as to it rigidly to the desired suspension-point and clamp and hold the line-wire 2l between without injury to the wire covering, the enthem7 consist .of the clamping-sleeves Lire apparatus being Of a. Simple, cheap, and These clamping-sleeves are provided with an 8o 3o durable construction, adapted to be readily internal conical screw-thread at the end admanipulated by linemen'of ordinary skill. jacent to the pieces 10 15, and their opposite The construction shown herein embodies ends are bell-mouthed so as `to permit the certain generic features shown in my applicaline-wire to sway with the wind without tion for Letters Patent, Serial No. 328,594, comingin contact with the inner walls ofthe 85 tiled October 29, 1889, and constitutes an iinbell-mouth.

provenient upon the device shown in said The clamping-sleeves are preferably of application. 5 hard wood, as oak, and the pieces 10 15 of In the accompanying drawings, Figure 1 softer wood, suoli as yellow or white cedar, represents in side elevation a portion of a and the conical ends of the pieces 10 15 are 4o supporting-pole provided with my improvepreferably without a screw-thread when put ments.' Fig. 2 represents, on an enlarged scale, in place. This construction enables 'the harda cross-section taken on the line 2 2 of Fig. 1. wood clamping-sleeves to cut their own Figli represents, also on an enlarged scale, an thread 4upon the softer conical ends of the end view of one of the clamping-sleeves. Fig. pieces 10 15, thereby insuring a substantial 4 represents a vertical central longitudinal and satisfactory joint. At their under porh section through the entire device. Fig. 5 reptions the clamping-sleeves are slotted, as inresents a horizontal central longitudinal seedicated at 23, so as to permit them to pass over tion of the same; and Fig. 6 represents a botthe line-wire.

tom plan view of the upper cap-piece before The mode of operation is'as follows: The 5o the sleeves have been applied, the rubber bed-piece 10 is nrstsseenred to the cross-pieces lining belng shown as broken away. 8 9, and the line-wire 1s then stretched along IOO the piece lO so as to rest upon the rubber lining of the longitudinal groove therein. The cap-piece l5 is then superimposed upon the line-Wire and held in place until the clamping-sleeves 22 are screwed on. These clamping-sleeves gradually force the cappiece l5 with constantly-increasing clamping effect upon the line-wire 21,*binding it firmly and rigidly within the longitudinal grooves and forcing the rubber lining into the screwthread iudentations 12 18, so that the subsequent end strain upon said linings, due to the weight of the suspended wire, shall not be able to pull said linings out of the grooves. The clamping-sleeves are screwed up until the binding action is sufcient, compensating washers, as 24.-, being provided, if needful. After the clamping-sleeves are screwed on the spaces left along each side of tlie'rubber lining' between the pieces l0 l5 are filled in with tar-yarn, mast-ic, or other suitable filling that will protect the edges of the rubber from atmospheric influences.

The line-wire may be readily released at any time, should occasion require, by merely unscrewing the clamping-sleeves.

It is of course evident that if desired I may employ as a substitute for the rubber lining any other lining of a sufficiently elastic and fiexible character, such as tar-yarn,light felt or the like, although for most purposes I find the employment of rubber the more advantageous.

Having thus described my invention,what I claim, and desire to secure by Let-ters Patent, 1s-

l. In an overhead or air-line system of electrical conductors, the combinatiomwith a supporting-piece orbed-piece for the line-wire, of a cap-piece therefor, both of said pieces having tapering ends, and internally screwthreaded clamping-sleeves fitting over said ends and adapted to draw the cap-piece down toward the bed-piece, so as to clamp the linewire between them,said clamping-sleeves being of harder material than the tapering ends, so as to cut a screw-thread upon the latter during the clamping operation, substantially as described.

2. In an overhead or air-line system of electrical conductors, the combination,with asupporting-piece or bed-piece having a longitudinal groove provided with a flexible or elastic lining for the reception of the line-wire, of a cap-piece of like construction, both of said pieces having tapering ends, and internallyscrew-threaded clamping-sleeves fitting over said ends and adapted to draw the cap-piece down toward the bed-piece, so as to clamp the line-Wire between them, substantially as described.

3. In an overhead or air-line system of electrical conductors, the combination, with a supporting-piece or bed-piece having a longitudinal groove provided with a fiexible or elastic lining for the reception of the line-wire and with cross-indentations back of said lining, ot a cap-piece of like construction, both of said pieces having' tapering ends, and internally-screw-threaded clamping-sleeves fitting over said ends and adapted to draw the cappiece down toward the bed-piece, so as to clamp the line-wire between them, substantially as described.

Ll. In an overhead or air-line system of electrical conductors, the combination, with a supporting-piece or bed-piece having a longitudinal groove provided with a iieXible or elastic lining for the reception of the line-wire, of a cap-piece of like construction, both ot said pieces having tapering ends, and internallyscrew-threaded clamping-sleeves fitting over said ends and adapted to draw the cap-piece down toward the bed-piece, so as to clamp the line-wire between them, and a protective filling between the bed-piece and cap-piece along the edges of the lining, substantially as described.

5. In an overhead system of electrical conductors, the combination, with a supportingpiece or bed-piece for the line-wire, ot a cappiece therefor, both of said pieces being made of soft wood and having tapering ends, and internally-serew-threaded clam ping-sleeves of harder material adapted to cut screw-threads upon said tapering ends and to draw the cappiece down upon the bed-piece, so as to clamp the line-wire between them, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES F. MUNSIE.

XVitnesses:

JOHN C. PENNIE, Il. B. ZEvELv.

IOO 

